At the end after a long period of testing and changing the part can be produce or the engineer has to give up finally.
经过一段长时间的不断测试和改进这个产品可能调整到可生产的状态，或也有可能最终放弃。
At the end after a long period of testing and changing the part can be produce or the engineer has to give up finally.
经过一段长时间的不断测试和改进这个产品可能调整到可生产的状态，或也有可能最终放弃。
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